Data Sheet
Non-Isolated Step-Down 3-Terminal DC/DC Converters
BP5275-18 / BP5275-25 / BP5275-33 / BP5275-50
Description
The BP5275 series of DC/DC converters utilize a synchronous
rectification system.
A control circuit, switching element, and coil are built in, along
with input/output capacitors, resulting in stable operation with
no external components required.
High conversion efficiency, combined with an original heat
dissipation structure, enables configuration an ultra-compact
switching power supplies.
500mA output is possible with no heat sink required (800mA
with heat sink).
In addition, the ICs are pin-compatible with conventional
TO-220 LDO regulators, making replacement easy.
Low ripple voltage with high precision output ensure stable
operation against the fluctuating voltages from main power
supplies, making them ideal for use as local power supplies
(i.e. for microcontrollers).
Applications
Power supplies for copiers, personal computers,
facsimiles, AV equipment, measuring instruments,
vending machines, security device, registers,
industrial equipment, and maintenance tools
Features
1) No external parts required
2) High power conversion efficiency.
3) Heat sink unnecessary.
4) Low output ripple voltage
5) High output voltage accuracy
6) Pin-compatible with conventional 3-pin LDOs
7) Compact package.
BP5275-18 / BP5275-25 / BP5275-33 / BP5275-50 : SIP3
List of the series
Dimensions
(Unit : mm)
ot
Input voltage
Output voltage
N
Maximum output current
(no heat sink / include heat sink)
Power conversion
efficiency (Vin=12V)
Absolute maximum ratings (Ta=25°C)
Parameter
Input voltage
Operating temperature range
Storage temperature range
Allowable maximum surface temperature
Maximum output current 1
Maximum output current 2 (with Heat Sink)
Symbol
V
In
Topr
Tstg
Tcmax
I
O
1max
I
O
2max
Limits
BP5275
−
18
15
−30
to 85
−40
to 105
100
500
800
BP5275
−
25
15
−30
to 85
−40
to 105
100
500
800
BP5275
−
33
15
−30
to 85
−40
to 105
100
500
800
BP5275
−
50
15
−30
to 85
−40
to 105
100
500
800
Unit
V
ec
N
ew om
m
D
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ig de
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f
13.8 MAX
2xC0.5
5.2
2.6
4.0±1.0
23.0 MAX
20.3
2.54±0.2
0.75
1.3
2.54±0.2
0.5
Pin No.1 2 3
4.2
5.2
Note : Dimensions without tolerance is typical.
R
BP5275
−
18
4.5 to 14
1.8
500 / 800
73
BP5275
−
25
4.5 to 14
2.5
500 / 800
78
BP5275
−
33
5.0 to 14
3.3
500 / 800
83
BP5275
−
50
6.0 to 14
5.0
500 / 800
88
www.rohm.com
© 2011 ROHM Co., Ltd. All rights reserved.
1/7
or
C0.5
Unit
V
V
mA
%
°C
°C
°C
°C
°C
2011.08 -
Rev. A
BP5275-18 / BP5275-25 / BP5275-33 / BP5275-50
Data Sheet
Block diagram
Measurement circuit
Control
Circuit
1 2 3
Vin
Io
A
V
A
Vout
Vin
V
V
GND
GND
Electrical characteristics
BP5275−18
(Unless otherwise noted : Ta=25°C, Vin=12V, lo1=500mA)
Parameter
Input voltage
Symbol
Vin
V
O
Min.
4
Typ.
12
Output voltage
Output current 1
Output current 2
Line regulation
Load regulation
Output ripple voltage
Minimum start-up time
Conversion efficiency
Operation frequency
1
Derating required according to the input voltage and ambient temperature.
BP5275-25
(Unless otherwise noted : Ta=25°C, Vin=12V, lo1=500mA)
Parameter
Input voltage
Symbol
Vin
V
O
Min.
4
Typ.
12
R
Output voltage
Output current 1
Output current 2
Line regulation
ot
Load regulation
Output ripple voltage
Minimum start-up time
Conversion efficiency
N
Operation frequency
1
Derating required according to the input voltage and ambient temperature.
www.rohm.com
© 2011 ROHM Co., Ltd. All rights reserved.
ec
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Max.
14
Unit
V
Conditions
DC
1.75
0
1.80
1.85
500
800
50
50
80
V
I
O
1=0mA
I
O
1
I
O
2
Vr
Vl
mA
mA
mV
1
1
0
With heat sink
Vin=4 to 14V
5
10
5
7
mV
I
O
=0 to 500mA
Vp
Ts
f
mV
P-P
msec
%
4
Vin=0V
3V,Ro=3.6Ω
65
73
1.5
MHz
Max.
14
Unit
V
Conditions
DC
2.45
0
2.50
2.55
500
800
50
50
50
V
I
O
1=0mA
I
O
1
I
O
2
Vr
Vl
mA
mA
mV
mV
0
With heat sink
Vin=4 to 14V
5
10
5
7
78
I
O
1=0 to 500mA
Vp
Ts
f
mV
P-P
msec
%
MHz
4
73
Vin=3V
4V,Ro=5Ω
1.5
2/7
or
1
1
2011.08 -
Rev. A
BP5275-18 / BP5275-25 / BP5275-33 / BP5275-50
Electrical characteristics
BP5275−33
(Unless otherwise noted :Ta=25°C, Vin=12V, lo1=500mA)
Parameter
Input voltage
Output voltage
Output current 1
Output current 2
Line regulation
Load regulation
Output ripple voltage
Minimum start-up time
Conversion efficiency
Operation frequency
Symbol
Vin
V
O
I
O
1
I
O
2
Vr
Vl
Vp
Ts
f
Min.
4.5
3.23
0
0
4
78
Typ.
12
3.30
5
10
5
7
83
Max.
14
3.37
500
800
50
50
50
Unit
V
V
mA
mA
mV
mV
mV
P-P
msec
%
Vin=3V
With heat sink
Vin=4.5 to 14V
DC
I
O
1=0mA
1
1
Data Sheet
Conditions
4.5V,Ro=6.6Ω
1
Derating required according to the input voltage and ambient temperature.
BP5275-50
(Unless otherwise noted : Ta=25°C, Vin=12V, lo1=500mA)
Parameter
Input voltage
Symbol
Vin
V
O
Min.
6
Typ.
12
Output voltage
Output current 1
Output current 2
Line regulation
Load regulation
Output ripple voltage
Minimum start-up time
Conversion efficiency
Operation frequency
1
Derating required according to the input voltage and ambient temperature.
●OPERATION
NOTES
・This
module will stop outputting because of protection circuit when the input voltage becomes maximum input voltage or less.
Please note that the input voltage must not become maximum input voltage in any state of the load.
・After
the circuit starts, the output voltage needs to become the fixed voltage within minimum activation time.
If the output voltage is below the fixed voltage after the minimum activation time, it doesn’t work because of the protection circuit.
Please evaluate sufficiently about activation characteristics of input voltage and load characteristics when starting.
N
ot
・When
the output circuit shorts, short-circuit protection of timer-latch type will work and stop outputting.
To release the protection, it is necessary to turn on the switch again.
This product also has protection element for safety. The protection element is fused if the current, with which the protection
element will fuse, will be input by the time the short-circuit protection of timer-latch hangs.
Please evaluate sufficiently at using environment about the action when the output circuit shorts.
・There
are some case that the heat generates at the module by exceeding allowable maximum surface temperature when the
load current which exceeds the maximum output current is electrified.
Please make design keeping enough margins not to exceed allowable maximum surface temperature at any time under any
application or any test conditions.
・The
heat sink at back parts of the product is connected to GND. Please mind the arrangement not to contact with
surrounding parts.
www.rohm.com
© 2011 ROHM Co., Ltd. All rights reserved.
ec
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1.5
MHz
Max.
14
Unit
V
Conditions
DC
4.9
0
5.0
5.1
V
I
O
1=0mA
I
O
1
500
800
50
50
50
mA
mA
mV
mV
1
1
I
O
2
Vr
Vl
0
With heat sink
Vin=6 to 14V
5
10
5
7
I
O
1=0 to 500mA
Vp
Ts
f
mV
P-P
msec
%
4
Vin=3V
6V,Ro=10Ω
83
88
1.5
MHz
R
3/7
or
2011.08 -
Rev. A
I
O
=0 to 500mA
BP5275-18 / BP5275-25 / BP5275-33 / BP5275-50
●BP5275-18
Data Sheet
Line Regulation
Output Voltage vs. Temperature Fluctuation（Vin=12V）
1.85
1.84
Output Voltage
Vo [V]
1.83
1.85
1.84
1.83
Output Voltage
Vo [V]
1.81
1.80
1.79
1.78
1.77
1.76
1.75
0
1.81
1.80
1.79
1.78
1.77
1.76
1.75
ec
N
ew om
m
D
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ns d
f
Ta= 80°C
Ta= 25°C
Ta=−35°C
14
2
4
6
8
10
12
16
0
100
Intput Voltage
Vin [V]
100
90
80
70
60
50
40
30
20
10
0
200
300
400
Output Current
Io [½Ａ]
Output Voltage vs. Input Voltage Fluctuation（Ta=25
°C
）
1.85
1.84
1.83
Output Voltage
Vo [V]
1.82
1.81
1.80
1.79
1.78
1.77
1.76
1.75
0
Power Conversion Efficiency Fluctuation（Ta=25
°C
）
Vin= 6V
Power Conversion Efficiencyη[%]
Vin=12V
Vin=14V
ot
R
100
200
300
400
Output Current
Io [½Ａ]
500
0
100
200
300
400
Output Current
Io [½Ａ]
Derating Curve (No heat sink)
Derating Curve (With heat sink)
Vin=12V以下
Vin=14V
N
600
Vin=10V以下
Vin=12V
Vin=14V
1000
76℃
500
65℃ 75℃
800
Load Current Io1 [mA]
400
Load Current Io2 [mA]
600
550mA
333mA
300
OPERATION
R
R
RANGE
200
250mA
400
OPERATION RANGE
200
100
0
-40
-20
0
20
40
60
80
100
0
-40
-20
0
20
40
60
80
100
Ambient Temperature Ta [
°C
]
Ambient Temperature Ta [
°C
]
www.rohm.com
© 2011 ROHM Co., Ltd. All rights reserved.
4/7
or
Ta= 80°C
Ta= 25°C
Ta=−35°C
500
1.82
1.82
Vin= 6V
Vin=12V
Vin=14V
500
2011.08 -
Rev. A
BP5275-18 / BP5275-25 / BP5275-33 / BP5275-50
●BP5275-25
Data Sheet
Line Regulation
2.55
2.54
2.53
Output Voltage vs. Temperature Fluctuation（Vin=12V）
2.55
2.54
2.53
Output Voltage
Vo [V]
Output Voltage
Vo [V]
2.51
2.50
2.49
2.48
2.47
2.46
2.45
2.51
2.50
2.49
2.48
2.47
2.46
2.45
ec
N
ew om
m
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es en
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ns d
f
Ta= 80°C
Ta= 25°C
Ta=−35°C
14
2
4
6
8
10
12
16
0
100
Intput Voltage
Vin [V]
100
90
80
70
60
50
40
30
20
10
0
200
300
400
Output Current
Io [½Ａ]
Output Voltage vs. Input Voltage Fluctuation（Ta=25
°C
）
2.55
2.54
2.53
Output Voltage
Vo [V]
2.52
2.51
2.50
2.49
2.48
2.47
2.46
2.45
0
Power Conversion Efficiency Fluctuation（Ta=25
°C
）
Vin= 6V
Power Conversion Efficiencyη[%]
Vin=12V
Vin=14V
R
0
100
200
300
400
Output Current
Io [½Ａ]
500
0
100
Output Current
Io [½Ａ]
ot
Derating Curve (No heat sink)
Vin=10V以下
Vin=12V
Vin=14V
Derating Curve (With heat sink)
1000
74℃
Vin=12V以下
Vin=14V
N
600
500
65℃ 75℃
800
Load Current Io1 [mA]
400
Load Current Io2 [mA]
600
528mA
333mA
300
OPERATION RANGE
R
R
200
250mA
400
OPERATION RANGE
200
100
0
-40
-20
0
20
40
60
80
100
0
-40
-20
0
20
40
60
80
100
Ambient Temperature Ta [℃]
Ambient Temperature Ta [℃]
www.rohm.com
© 2011 ROHM Co., Ltd. All rights reserved.
5/7
or
Ta= 80°C
Ta= 25°C
Ta=−35°C
500
2.52
2.52
Vin= 6V
Vin=12V
Vin=14V
400
500
200
300
2011.08 -
Rev. A
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